A Darwin man has suffered serious injuries to both his legs after being run over by a grass slasher in a workplace incident.

The man is in a critical condition in Royal Darwin Hospital after emergency services responded to calls on a property at Middle Point, south of Darwin, just after 7:00pm on Saturday.

The details of how he was run over by the industrial mower are still unclear, but Craig Garraway, duty manager at St John Ambulance, said it was a harrowing incident for crews to respond to.

"For our paramedics and the people on the scene — there was a number of people on the scene trying to help the male — [it was] quite a traumatic incident as you can imagine for everyone involved," he said.

"That person will be undergoing intensive treatment overnight at Royal Darwin Hospital and today, hopefully he recovers."

Careflight services were unable to assist with the transfer of the patient due to poor weather.

A spokesperson for NT WorkSafe has confirmed it was an industrial incident, but it remained uncertain what job the man was undertaking.

"NT Worksafe were notified of the incident last night," he said.

"Inspectors have been out on site this morning and continue to be there.

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